Otto Birnbaum (Revent): Conviction, Follow-Ons & 100x Outcomes

Otto Birnbaum (Revent): Conviction, Follow-Ons & 100x Outcomes

Author: Hugo Rauch March 4, 2026 Duration: 42:21

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🌊 Obsession, Timing & the 50x Decision

What it really takes to back, and double down on, a climate breakout.

We’re joined by Otto Birnbaum, Founding Partner at Revent, an early-stage fund backing companies at the intersection of climate, demographic, and technological change. Revent was an early investor in tem, which recently raised a $75M round.

In this conversation, we unpack what happens inside a fund when a breakout company emerges, and how to think about follow-on strategy, ownership, timing, and conviction.

This episode is a masterclass in early-stage venture mechanics.

In our conversation, we covered:

→ How to spot exceptional founders (obsession, clarity of vision, and relentless execution)

→ Why Revent avoids the word “impact” (and what they focus on instead)

→ The original investment thesis behind tem

→ What a $200M+ valuation means for a $60M fund

→ How much ownership early-stage funds really need

→ When to double down, and when to de-risk at 50x

→ Why timing might matter more than anything else

→ Why 2026 belongs to AI, but climate infrastructure is far from dead

→ “Looking left” when everyone looks right

Otto breaks down fund math transparently:

10% ownership at a $300M valuation = ~$30M position

For a $60M fund, that’s half the fund returned, at least on paper

True breakout? When it returns the whole fund.

We also explore:

Why SPVs matter when you hit concentration limits

How to construct angel-heavy cap tables with “superpowers”

Why growth rate alone isn’t enough, margin and revenue stickiness matter

And the brutal truth: timing can kill or make a company.



This is a public episode. If you would like to discuss this with other subscribers or get access to bonus episodes, visit newwavenewsletter.substack.com

Hugo Rauch hosts New Wave, a podcast that lives at the intersection of business ambition and scientific reality. This isn't about distant predictions or abstract science; it's a grounded exploration of the technologies and companies being built right now to address our environmental future. Each episode focuses on the practical journey, dissecting the models, the breakthroughs, and the hard decisions that define the climate tech landscape. You'll hear from founders, researchers, and investors who are actively shaping this space, getting into the specifics of what works, what doesn't, and why. The conversations move beyond hype to examine the tangible mechanics of creating viable solutions, from energy storage and sustainable materials to carbon removal and regenerative agriculture. It’s for anyone who thinks about the climate challenge not just as a crisis, but as a complex and urgent field of innovation. By tuning into this podcast, you gain a clearer understanding of the economic forces and scientific principles driving the next generation of environmental solutions. New Wave connects the dots between the lab, the boardroom, and the impact we need to see in the world, offering a sober yet optimistic look at where substantive progress is truly being made.
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